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Stiind ca a-b= 7,iar a+b+2c =53, cat este b+ c=?

Răspuns :

a+b+2c=53
 a-b=7
 a+b+2c-a+b=53-7
2b+2c=46
2(b+c)=46
b+c=46:2
b+c=23